Galvanic cell.



`1\I0`.`738,718. PATBNTED SEPT. a, 11903.

\ L. PIEDLER.

` GAINANIGCELL.

` APPLICATION FILED DEO. 22, 1902.

N0 MODEL.

mi noem: PE1-:Rl ou.. PHOTO-LMD.. wAsumnrcn, n. c.

UNITED STATES l Patented september e, 1903.

`LOTHAR FIEDLER, OF LONDON, ENGLAND, ASSIGNOR` OF ONE-HALE TO GEORGE PEARSON, OF PI'IXFOUR, ILFORD, ENGLAND.

GALVANIIC CELL.

. SPECIFICATION forming part of Letters Patent N o. 738,718, dated Septembery 8, 1903. nepneetientied December 22,1902. serien Ne. 136,281. (ne model.)

To all whom it may concern:

Be it known that I, LoTHAi; FIEDLER, a sub- `7l Huntley street, Tottenham Court Road,

London, in the county ofMidd leseX, England, i have invented a new and `useful Improvement in Galvanic Cells, of which thefollowing is a;

specification.

The present invention relates to a new galvanic cell which according to its construction acts in the first instance as a primary cell and which after becoming exhausted can be regenerated or recharged in thesame manner asa secondary cell.

produce a cell which .e is cheaply and easily manufactured, is highly efficient and con- Vstantin action, and is, moreover, portable,

' the electrolyte being unspillable.

In the accompanying drawings,which` illustrate by way of example one method of constructing a cell accordingV to this invention, Figure l is a view in sectional elevation, and

- Fig. 2 is a View in section on line was of Fig. l.

` papier-mache or other suitable non-conduct-` and an electrolyte.

Similar` letters refer to similar parts through-` out both views.

The outer containing vessel a is made of ingor insulating material and is adapted to contain the positive-pole electrode or element b, the negative-pole electrode` or element c, The bottom of the vessel ct is furnished with a layer d of bitumen,

pitch, or like insulating material, which not` layer g of sawdust, rice-husks, or the like is placed over the layerf and is covered in by a second plate e', of pasteboard or the like, ovel` which is formed fthe outer layer h of bitumenforother insulating compound. A vent-pipe t `is "provided, communicating betweenthe insideof the cell and the gas-space or layer gdanda s`econd`vent-pipe 'i' between the gas-space orlayer g'and the atmosphere The object of the present invention is toA in order to allow of the escape of gases gen- The ends of the elec- Y erated within the cell. trodes or elements or pieces connected thereto pass through the various layers and are provided With usual terminal-screws 7c l.

The positive-pole electrode or element b consists of a rectangular tube surrounded on `its outside by a similarly-shaped tube forming part of the negative-pole electrode or element c and containing within it a series of plates c, joined or connected at their lower edges to a plate c2in contact or made in one with the outer part of the said negative-pole electrode or element. The positive-pole electrode or element may be of carbon, but is preferably of lead and formed or covered on each of its sides with a coating of lead peroXid, (PbO2,) or hydrated lead peroxid, (H2Pb2O5.)

This electrode or element is of the usual gridlike form and may be formed in the manner usually employed in the construction of positive-pole electrodes for the well-known types `ot' secondary batteries.

The various parts of the negative-pole electrode or element are made of zinc, having an active surface produced by electrodeposition of cyanid zinc and mercury in the manner set forth in an application for patent filed concurrently with this present application.

The various spaces m formedgby and between the outer vessel a and the various parts of the electrodes or Aelements-that is to say,

the whole of the available interior space-are filled with an electrolyte compounded from the following ingredients in or about the proportions stated: of a solution of a density of `24J Baume of sodium silicate, (NagOiSiOgJ one thousand grams; of a solution having a density of 33 Baume of sulfuric acid, (HSOp') three thousand grams, and of mercuric sulfate, (HgSO4,) fifty grams. After this solution is compounded it is atvonce poured into the cell, and in a little time it solidides into a jelly-like mass.

A cell constructed as hereinbefore described is immediately ready for use and has anelectromotive force of about 2.5 volts, is `eX- tremely constant in action, has nofllocal action on open circuit, and has alarge` capacity. It can be discharged till the electromotive electrode, of a rectangular tube-like form and having an active surface of lead peroxid, a negative-pole electrode, of a rectangular tubelike form surrounding the positive-pole electrode and in connection with a series of plates Within the said electrode and having active surfaces of cyanid zinc and mercury, an electrolyte comprising sodium silicate, sulfuric acid and mercurio sulfate, and an outer vesvSel of insulating material adapted to contain the electrodes and electrolyte, as set forth.

. 3. A galvanic cell comprisingapositive-pole electrode of a rectangular tube-like form and having an active surface of lead peroxid, a negative-pole electrode, ofa rectangular tubelike form surrounding the positive-pole electrode and in connection with a series of plates Within the said electrode and having active surfaces of cyanid zinc and mercury, an electrolyte comprising sodium silicate, sulfuric acid and 'mercurio sulfate, .au outer vessel, of insulating material adapted to contain the electrodes and electrolyte, alayer of insulating material adapted to hold in position and insulate the electrodes from one another at their lower ends, two layers of insulating material separated from each other and forming a cover to the containing vessel, a gas-space formed between the two layers of insulating material and filled With a granular material and vent-pipes communicating from the inside of the cell to the gas-space and from the gas-space to the atmosphere, as set forth.

Lori-IAR FIEDLER.

Vitnesses: f A. MILLWARD FLACK, G. V. SYMES. 

